So sadly #19 remained unguessed. Farsala came close with guessing it was a Star Wars game, but sadly couldn't put his finger on it. Time to move on. #18 is in a similar position as #19 was; it's coming into its last day, so here's a final hint, barring maybe a last minute one fifth hint if someone gets close. Also new hints for #17 and #16 and the first for #15.
#18: This game features a building named "Kong Tower", which is fitting because it kind of looks like the real 'Kong' tower.
Hint 2: It's $$$ commercial and 3x3 large.
Hint 3: The funny thing is, even though this is a big and tall building, it'll be gone again in no time if you don't check the box to make it a monument.
Hint 4: So at some point I have like 20 monumented skyscrapers in my city because otherwise before you know it's gone and there's a 3x3 "Crazy Larry's Flea Market" in its place. And that wouldn't really be realistic would it.
#17: The Mac OS version of this game (at least) featured an interesting anti-piracy measure where you had to look up letters in the manual.
Hint 2: Once you find the correct letter, you can drink the correct bottle and the door to the next level opens. Drink the wrong one, and die.
Hint 3: This actually mirrors the rest of the game, most bottles are for health, while some take health. You see this by the color of its plume. Obviously though there is no plume in the lettered bottles because that would be too easy to guess.
#16: Breaking a mirror brings bad luck. Maybe the bad guy in this game shouldn't have broken the mirror.
Hint 2: The bad guy also should've known that the mirror would break in only four pieces, and that they would conveniently end up at the end of as many sinister places.
#15: This game was named something else where I live due to trademark issues.